Support unit for adjusting a chair seat depth



FIG. 1 is a perspective view from above of a support unit for adjustinga chair seat depth embodying my new design;

FIG. 2 is a perspective view from below of the adjustment device; and

FIG. 3 is a front perspective view from below of the adjustment device.

The ornamental design for a support unit for adjusting a chair seatdepth, substantially as shown and described.